Hey all, I have an 04 evo 8 and two days ago my A/F started reading 10.0 and a couple of times would give me the three dashes with no numbers. At idle my vaccum would read 10 instead of 20 like normal and when I would start to drive my car would sputter and hesitate, so I changed the plugs yesterday but no luck, still going the same thing. I have two videos I will post for better understanding. If anyone has any advice to give or anything please let me know! Thanks.

 

Bump...

 

When you changed the plugs how did they look ? when it reads 10.0 on the AFR gauge is that at idle ? Looks to me your running filthy rich.

 

What mods are on the car?

 

Mods are listed on my signature, it runs 10.0 driving and idle and sometimes my gauge won't even give me a reading. Here is what they looked like.

 

The spark plugs look normal, no check engine light ? And are you still on MAF ? Do a compression test, fuel pressure test, check for any unplugged hoses and a boost leak test.

 

If you lost half of your vacuum you could have a boost leak.

 

No engine light, I have the injen intake MAF. I need to go out and buy things to do all these tests now lol. Thanks for the info so far guys.

 

Im suprised you dont have a check engine light on sounds like its missing I would suspect a bad coil or Intake leak

 

Fpr vacuum line? Just a shot

 

Took it to the shop today, and after running over a damn chunk of tire on the freeway which ripped off my lower lip to my bumper, it also smashed my intercooler into my tow bar. At 22psi it had 100% boost leak.